Message-ID: <394d3b3947c2a95895b0cb8f99dbeb095eacba64.camel@kernel.org>
Subject: Re: [PATCH] cifs: move superblock magic defitions to magic.h
From:   Jeff Layton <jlayton@kernel.org>
To:     Steve French <smfrench@gmail.com>
Cc:     CIFS <linux-cifs@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
Date:   Mon, 10 Jan 2022 19:29:33 -0500
In-Reply-To: <CAH2r5mtuDExJ981zs_Y=pDZhRyoTFQkKVcWef3Z=QNkz=QSyyA@mail.gmail.com>
References: <20220111000002.139789-1-jlayton@kernel.org>
         <CAH2r5mtuDExJ981zs_Y=pDZhRyoTFQkKVcWef3Z=QNkz=QSyyA@mail.gmail.com>
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On Mon, 2022-01-10 at 18:15 -0600, Steve French wrote:
> Patch looks fine to me.  Do you want me to add it to the cifs for-next
> for this merge window, or do you want it merged through a different
> tree?
> 

If you can take it in via the cifs tree, then that'd be best. I think
it's a pretty safe patch, but there's no real rush for it. 5.17 or 5.18
is fine.

Thanks,
Jeff

> On Mon, Jan 10, 2022 at 6:00 PM Jeff Layton <jlayton@kernel.org> wrote:
> > 
> > Help userland apps to identify cifs and smb2 mounts.
> > 
> > Signed-off-by: Jeff Layton <jlayton@kernel.org>
> > ---
> >  fs/cifs/cifsfs.c           | 3 ++-
> >  fs/cifs/cifsglob.h         | 2 --
> >  fs/cifs/smb1ops.c          | 3 ++-
> >  fs/cifs/smb2glob.h         | 2 --
> >  fs/cifs/smb2ops.c          | 5 +++--
> >  include/uapi/linux/magic.h | 4 ++++
> >  6 files changed, 11 insertions(+), 8 deletions(-)
> > 
> > diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
> > index dca42aa87d30..5a4d56622d2b 100644
> > --- a/fs/cifs/cifsfs.c
> > +++ b/fs/cifs/cifsfs.c
> > @@ -26,6 +26,7 @@
> >  #include <linux/random.h>
> >  #include <linux/uuid.h>
> >  #include <linux/xattr.h>
> > +#include <uapi/linux/magic.h>
> >  #include <net/ipv6.h>
> >  #include "cifsfs.h"
> >  #include "cifspdu.h"
> > @@ -202,7 +203,7 @@ cifs_read_super(struct super_block *sb)
> >                 sb->s_time_max = ts.tv_sec;
> >         }
> > 
> > -       sb->s_magic = CIFS_MAGIC_NUMBER;
> > +       sb->s_magic = CIFS_SUPER_MAGIC;
> >         sb->s_op = &cifs_super_ops;
> >         sb->s_xattr = cifs_xattr_handlers;
> >         rc = super_setup_bdi(sb);
> > diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> > index be74606724c7..50e857e0a311 100644
> > --- a/fs/cifs/cifsglob.h
> > +++ b/fs/cifs/cifsglob.h
> > @@ -24,8 +24,6 @@
> >  #include "../smbfs_common/smb2pdu.h"
> >  #include "smb2pdu.h"
> > 
> > -#define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
> > -
> >  #define SMB_PATH_MAX 260
> >  #define CIFS_PORT 445
> >  #define RFC1001_PORT 139
> > diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
> > index 3b83839fc2c2..dcc8b97e2bbf 100644
> > --- a/fs/cifs/smb1ops.c
> > +++ b/fs/cifs/smb1ops.c
> > @@ -7,6 +7,7 @@
> > 
> >  #include <linux/pagemap.h>
> >  #include <linux/vfs.h>
> > +#include <uapi/linux/magic.h>
> >  #include "cifsglob.h"
> >  #include "cifsproto.h"
> >  #include "cifs_debug.h"
> > @@ -878,7 +879,7 @@ cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
> >  {
> >         int rc = -EOPNOTSUPP;
> > 
> > -       buf->f_type = CIFS_MAGIC_NUMBER;
> > +       buf->f_type = CIFS_SUPER_MAGIC;
> > 
> >         /*
> >          * We could add a second check for a QFS Unix capability bit
> > diff --git a/fs/cifs/smb2glob.h b/fs/cifs/smb2glob.h
> > index ca692b2283cd..4125fd113cfb 100644
> > --- a/fs/cifs/smb2glob.h
> > +++ b/fs/cifs/smb2glob.h
> > @@ -13,8 +13,6 @@
> >  #ifndef _SMB2_GLOB_H
> >  #define _SMB2_GLOB_H
> > 
> > -#define SMB2_MAGIC_NUMBER 0xFE534D42
> > -
> >  /*
> >   *****************************************************************
> >   * Constants go here
> > diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> > index c5b1dea54ebc..57e856c195b5 100644
> > --- a/fs/cifs/smb2ops.c
> > +++ b/fs/cifs/smb2ops.c
> > @@ -13,6 +13,7 @@
> >  #include <linux/sort.h>
> >  #include <crypto/aead.h>
> >  #include <linux/fiemap.h>
> > +#include <uapi/linux/magic.h>
> >  #include "cifsfs.h"
> >  #include "cifsglob.h"
> >  #include "smb2pdu.h"
> > @@ -2747,7 +2748,7 @@ smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
> >                 goto qfs_exit;
> > 
> >         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
> > -       buf->f_type = SMB2_MAGIC_NUMBER;
> > +       buf->f_type = SMB2_SUPER_MAGIC;
> >         info = (struct smb2_fs_full_size_info *)(
> >                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
> >         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
> > @@ -2789,7 +2790,7 @@ smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
> > 
> >         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
> >                                    fid.volatile_fid, buf);
> > -       buf->f_type = SMB2_MAGIC_NUMBER;
> > +       buf->f_type = SMB2_SUPER_MAGIC;
> >         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
> >         return rc;
> >  }
> > diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
> > index a3034558b018..9438fd4a79c9 100644
> > --- a/include/uapi/linux/magic.h
> > +++ b/include/uapi/linux/magic.h
> > @@ -53,6 +53,7 @@
> >  #define QNX6_SUPER_MAGIC       0x68191122      /* qnx6 fs detection */
> >  #define AFS_FS_MAGIC           0x6B414653
> > 
> > +
> >  #define REISERFS_SUPER_MAGIC   0x52654973      /* used by gcc */
> >                                         /* used by file system utilities that
> >                                            look at the superblock, etc.  */
> > @@ -61,6 +62,9 @@
> >  #define REISER2FS_JR_SUPER_MAGIC_STRING        "ReIsEr3Fs"
> > 
> >  #define SMB_SUPER_MAGIC                0x517B
> > +#define CIFS_SUPER_MAGIC       0xFF534D42      /* the first four bytes of SMB PDUs */
> > +#define SMB2_SUPER_MAGIC       0xFE534D42
> > +
> >  #define CGROUP_SUPER_MAGIC     0x27e0eb
> >  #define CGROUP2_SUPER_MAGIC    0x63677270
> > 
> > --
> > 2.34.1
> > 
> 
> 

-- 
Jeff Layton <jlayton@kernel.org>